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SubjectRe: [Stable-review] [PATCH 20/23] tracing: Fix panic when lseek() called on "trace" opened for writing
Hi Ben,

On Mon, Feb 14, 2011 at 11:14:27PM +0000, Ben Hutchings wrote:
> On Mon, 2011-02-07 at 00:23 +0100, Willy Tarreau wrote:
> > 2.6.27.58-stable review patch. If anyone has any objections, please let us know.
> >
> > ------------------
> >
> > From: Slava Pestov <slavapestov@google.com>
> >
> > commit 364829b1263b44aa60383824e4c1289d83d78ca7 upstream.
> >
> > The file_ops struct for the "trace" special file defined llseek as seq_lseek().
> > However, if the file was opened for writing only, seq_open() was not called,
> > and the seek would dereference a null pointer, file->private_data.
> >
> > This patch introduces a new wrapper for seq_lseek() which checks if the file
> > descriptor is opened for reading first. If not, it does nothing.
> [...]
> > --- longterm-2.6.27.orig/kernel/trace/trace.c 2011-01-23 10:52:37.000000000 +0100
> > +++ longterm-2.6.27/kernel/trace/trace.c 2011-01-29 11:42:07.287067215 +0100
> > @@ -2041,17 +2041,25 @@
> > return ret;
> > }
> >
> > +static loff_t tracing_seek(struct file *file, loff_t offset, int origin)
> [...]
> > + .llseek = tracing_lseek,
> [...]
> > + .llseek = tracing_lseek,
> [...]
>
> These names don't agree!

Indeed, it's been fixed before releasing.
Thanks for the review anyway !

Willy



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